JS: move more test to box tests

js/js.translator/testData/box/propertyAccess/twoClassesWithProperties.kt

@@ -0,0 +1,16 @@
+package foo
+
+class A() {
+    val a: Int = 1
+}
+
+class B() {
+    val b: Int = 2
+}
+
+fun box(): String {
+    if (A().a != 1) return "fail1"
+    if (B().b != 2) return "fail2"
+
+    return "OK"
+}